gcc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations fcntl/F_GETOWN_EX.c -o fcntl/F_GETOWN_EX -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lxnet -lsocket -latomic
fcntl/F_GETOWN_EX.c:3:2: error: #error "F_GETOWN_EX is not defined"
    3 | #error "F_GETOWN_EX is not defined"
      |  ^~~~~